Rubjonnys 8v DIGI tune up guide question

[jammac]

just bought a CO gas tester  and am trying Rubjonnys tune up guide. before tampering with anything though ive become a little confused with the instuctions regarding the breather hose on the valve cover.

Rubjonny says

Idle/CO:
1. Get the engine up to temp, at least 80 degrees on the MFA oil temp display
2. Turn the engine off and remove & plug the intake side of the breather pipe between the 'flying saucer' on the rocker cover & air intake

haynes says
disconnect and plug the crankcase breather hose from the valve cover

please could someone clarify what/where exactly i need to plug up.

is it the flying saucer itself or do i leave that open?

or do i plug up the hose or leave it open?

cheers

[Agreeable Slick]

Haynes book of lies. Your choice. 

[jammac]

thanks for that slick. you havent answered my question though.

do i plug the hose or the flying saucer? and does the other remain open to the air?

[Mew]

I would imagine you want to plug where the air would go into the inlet, so if you take the hose off at the flying saucer then you need to block the hose to stop air going down it into the inlet.

[jammac]

kool nice one Mew! thats exactly what i wanted to hear.

 

[Mew]

That isn't 100% definite, but i don't see why it would be done any other way. From what i gather you are stopping any recirculated gases from entering the inlet and throwing out the CO reading. If you didn't block the inlet then there would be air flowing into the throttle body without going through the air flow meter, again throwing out the reading.

That's what i take to be the reasoning behind it, but someone may prove me wrong 

[jammac]

sounds logical and i like logical.

when you reconnect the breather hose after the tune up then the CO level in the exhuast gas will be differant? so........... just out of interest do you know the limits for CO on an MOT???

ive not actually had anything to do with an MOT in about 4 years so am quite frankly sh!tting myself as its approaching quickly and ive got a heap of stuff to do! 

[Mew]

From memory it is something like twice the value of what you set the golf to, so miles off basically!

[Organisys]

While we are on this subject, if the co is OK, then do you need to bother to disconnect the blue temp, rev etc just to do the idle?

[Agreeable Slick]

thanks for that slick. you havent answered my question though.

do i plug the hose or the flying saucer? and does the other remain open to the air?

Like i said mate, haynes book of lies, just reading it, why would you want to plug the hose that leads away from the inlet. 

Jon jons is the correct one.